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Biodiesel Resistance of Thin Resin Cr-free Steel Sheets for Fuel Tank

Biodiesel Resistance of Thin Resin Cr-free Steel Sheets for Fuel Tank. Dong-Joo Yoon , Kyung-Hwan Lee, Jong-Geun Choi Sunchon National University, Korea Sangkeol Noh, Jae-Ryung Lee POSCO Technical Research Lab, Korea. Introduction. Experimental Procedures. Contents.

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Biodiesel Resistance of Thin Resin Cr-free Steel Sheets for Fuel Tank

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  1. Biodiesel Resistance of Thin Resin Cr-free Steel Sheets for Fuel Tank Dong-Joo Yoon , Kyung-Hwan Lee, Jong-Geun Choi Sunchon National University, Korea Sangkeol Noh, Jae-Ryung Lee POSCO Technical Research Lab, Korea

  2. Introduction Experimental Procedures Contents Results & Discussion Conclusions

  3. Introduction • Higher corrosion rate of biodiesel in fuel tank than petroleum based fuels due to acidic contents(formic acid, acetic acid, oleic acid, etc) • Difficulties in quantitative evaluation of corrosiveness due to the variety in biodiesel, chemical substances in preparation phase, and corrosion environment, etc. • Since the actual testing on fuel resistance of fuel tank for biodiesel will take more than 10 years, various ways to evaluate assurance period for corrosion have been studied. • Generally cyclic corrosion test (CCT) is applied to determine relative corrosion resistance.

  4. Objectives • To analyze and evaluate the corresponding corrosion behavior for the degree of corrosiveness of biodiesel. • To determine the fuel resistance of thin resin Cr-free steel sheets, which is widely used as the steel sheets of automobile fuel tank • To investigate the effect of contents ratio between biodiesel and diesel fuel, water, and possible by-products during preparation of biodiesel

  5. Experimental Procedures Fig. 1 Schematic diagram of the double -layered Cr-free specimen Fig. 2 Shape & size of cup specimen

  6. Experimental Procedures Fig. 3 Shaking tester for corrosiveness of fuel and material

  7. Experimental Procedures Table 1. Specification of shaking tester

  8. Experimental Procedures Test conditions • Fuel : Diesel, Biodiesel(Soybean) • Agitation frequency : 1 Hz • agitation : 8hrs, 80℃ • 1 Cycle(1day) • stoppage : 16hrs, ambient temperature • Fuel replacement : every 14 cycles(2 weeks) • Total cycles : 56 cycles(8 weeks)

  9. Experimental Procedures Fig. 4 Cell size for comparison of corrosiveness in cup specimens

  10. Results & Discussion Fig. 5 Corrosion behaviour of cup specimens with increased contents of biodiesel containing H2O(10%)

  11. Results & Discussion (a) Time of corrosion occurrence (b) Corroded cell area Fig. 6 Corrosion test result for the case of containing H2O(10%)

  12. Results & Discussion Fig. 7 Corrosion behaviour of cup specimens with increased contents of biodiesel containing H2O(10%)+formic acid(20ppm)

  13. Results & Discussion (a) Time of corrosion occurrence (b) Corroded cell area Fig. 8 Corrosion test result for the case of containing H2O(10%)+formic acid(20ppm)

  14. Results & Discussion Fig. 9 Corrosion behaviour of cup specimens with increased contents of biodieselcontaining H2O(10%)+formic acid(20ppm) +methanol(10%)

  15. Results & Discussion 90 (a) Time of corrosion occurrence (b) Corroded cell area Fig. 10 Corrosion test result for the case of containing H2O(10%)+formic acid(20ppm) +methanol(10%)

  16. Results & Discussion Fig. 11 Corrosion behaviour of cup specimens with increased contents of biodiesel containing H2O(10%)+formic acid(20ppm) +methanol(10%) + peroxide(0.3%)

  17. Results & Discussion 90 (a) Time of corrosion occurrence (b) Corroded cell area Fig. 12 Corrosion test result for the case of containing H2O(10%) +formic acid(20ppm) +methanol(10%) + peroxide(0.3%).

  18. Results & Discussion Fig. 13 SEM image of corroded area in the case of containing H2O(10%)+formic acid(20ppm)+methanol(10%) + peroxide(0.3%) (a) corroded debris (b) substrate (c)Zn-Ni layer

  19. Results & Discussion Fig. 14 EPMA curves for the case of containingH2O(10%) +formic acid(20ppm)+methanol(10%) + peroxide(0.3%)

  20. Results & Discussion Table. 2 EPMA results of corrosive area in Fig 13(a), (b)

  21. Results & Discussion (a) Time of corrosion occurrence Fig. 15 Corrosion test result for allcases

  22. Results & Discussion (b) Corroded cell area Fig. 15 Corrosion test result for all cases

  23. Results & Discussion Fig. 17 SEM image of corroded area in the case of containing H2O+ H2S

  24. Results & Discussion Fig. 18 EPMA curves for the case of containing of H2O+ H2S

  25. Results & Discussion Table. 3 EPMA results of corrosive area in Fig. 15

  26. Conclusions • Peroxide additive has the strongest corrosiveness. Coating and plating layer are delaminated, and even substrate material is corroded. • For methanol, mixing with blended fuel shows the reduction in corroded area by reduction in the additive concentration. • Formic acid has weaker corrosiveness than peroxide, but corrosion is occurred throughout all the specimen. • Water is not mixed with fuel, and does not impact on corrosion significantly. However, water is easily mixed with other additives, and is considered to facilitate the corrosion by other additives.

  27. Thank You !

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